Experts watch their screens at the control center of the European Space Agency, ESA, in Darmstadt, Germany during a mission to land the first space probe on a comet. (AP Photo/dpa, Boris Roessler)
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Experts watch their screens at the control center of the European Space Agency, ESA, in Darmstadt, Germany during a mission to land the first space probe on a comet. (AP Photo/dpa, Boris Roessler)
